White Rodgers 1F89EZ-0251 Manual De Usuario

4

1.  Turn off power to the heating and cooling system.
2.  Remove the front cover of the old thermostat, this usually 

pulls off.

3.  Loosen the screws that hold the thermostat to the wall.
4.  Identify each wire attached to the old thermostat.
5.  Disconnect the wires from old thermostat one at a time. 

1.  Open  the  battery  door  and  detach  the  new  thermostat 

cover from the base.

2.  With the base flush against the wall, mark mounting hole 

locations on wall.

3.  Move base out of the way and drill mounting holes.
4.  Push wires through wire opening.
5.  Position the base on the wall again and screw the mounting 

screws into the wall anchors.

6.  Connect each wire coming from the wall to its corresponding 

terminal as shown in Fig. 2 on page 7.

Wires  will  not  be  connected  to  all  terminals  of  the  terminal 
block.

For Electric Heat, heat pump or any system that requires the 
thermostat to turn on the blower on a call for heat– place the 
FAN (Ele/Gas) switch (Fig. 1) in the 

ON position. For Auxiliary 

and Emergency Heat systems that have a fan control to turn 
on the blower (independent of the thermostat) place switch in 
the 

OFF position.

The O/B switch on this thermostat is factory set to the “O” 
position. This will accommodate the majority of heat pump 
applications, which require the changeover relay to be 
energized in COOL. If the thermostat you are replacing or the 
heat pump being installed with this thermostat requires a “B” 
terminal, to energize the changeover relay in HEAT, the O/B 
switch must be moved to the “B” position.

1.  Move SYSTEM switch to 

HEAT position. If the heating 

system has a standing pilot, be sure to light it.

2.  Press 

 to adjust thermostat setting to 1° above room 

temperature. The heating system should begin to operate.  

3.  Press 

 to adjust temperature setting below room 

temperature. The heating system should stop operating.

If your system 

does not have a G terminal connection, skip to 

Heating System.
1.  Move SYSTEM switch to OFF position. 
2.  Move fan switch to 

ON position. The blower should begin 

to operate.

3.  Move fan switch to 

AUTO position. The blower should stop 

immediately.

1.  Move SYSTEM switch to 

COOL position.

2.  Press 

 to adjust thermostat setting below room 

temperature. The blower should come on immediately on 
high speed, followed by cold air circulation. However, if the 
setpoint temperature is flashing, the compressor lockout 
feature is operating (see Configuration menu, item 5).

3.  Press 

 to adjust temperature setting above room 

temperature. The cooling system should stop operating.

EMER bypasses the Heat Pump to use the heat source wired 
to  terminal 

W2  on  the  thermostat.  EMER  is  typically  used 

when compressor operation is not desired, or you prefer back-
up heat only.
1.  Move SYSTEM switch to EMER position, EMER will flash 

on the display. 

2.  Press 

 to adjust the thermostat above room tempera-

ture. The Aux heating system will begin to operate. The 
Flame icon ( ) will display flashing to indicate that the 
Aux system is operating.

3.  Press 

 to adjust the thermostat below room tempera-

ture. The AUX heating system should stop operating

R

C

O/B

W2

Y

G

L

Insert

Wire

Press down

Mounting

Hole

Mounting

Hole

Opening

for wires

O/B

Switch

Battery

Door

FAN

(Ele/Gas)

Switch